Extended advertisement scanner drop messages

[Ashishsult]

Hi,

I set sending of Ext. ADV at a periodicity of 500ms and scanning for 100% time by setting same interval and window configuration to 2.56 s.

But I observed that the scanner stop receiving data sometimes randomly.

I use the code as provided here: https://devzone.nordicsemi.com/f/nordic-q-a/85850/example-for-extended-advertisement-receive-node 

I checked it from Saleae logic analyzer log as attached by toggling a GPIO pin on each data arrivals.

singledevice_500ms.zip 

Is this a normal behaviour?

Moreover, how should the scanner behave when we have more than one broadcast devices?

[Kenneth]

This looks like normal packet loss due to interference. You can try to move the boards closer togheter and see if the packet loss is reduced.

Kenneth

[Ashishsult]

HI Kenneth, I test with both the node placed next to each other and therefore, I was thinking if that is normal.

Plus, I want to know how the scanner would behave when we have multiple Ext Advertisers. Is it possible that it receive only from 1st node for some time and doesn't receive packets from other nodes. Later, it can switch to another node.

[Ashishsult]

 Hi Kenneth, Thanks for your answer. I also want to know how the scanner would behave when we have multiple Ext Advertisers.

[Kenneth]

I would assume that after receiving an ext advertising it will return to scanning for any advertisment/ext advertisement:
https://devzone.nordicsemi.com/guides/nrf-connect-sdk-guides/b/software/posts/building-a-ble-application-on-ncs-sdk---contrasting-to-softdevice-based-ble-applications---part-2-central-role#mcetoc_1f4ua7m2t0 

Kenneth